Speed-indicator.



, Patented Apr. I7, |900. .LV c. Annan. SPEED INDICATOR.

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' 'mf-mn STATES PATENT canes.

JAMES o. ARMOR, or PITTsBURG, rENNsYLvANiA.

sPEoIrIoirroN forming part or Letters Patent No. 647,791, dated alpini 17, 1900.

Applicant mea Maier 22,' 1899.

T0 all whom it may concern:

Be it known that I, J AMES C. ARMOR, a citizen of the United States, residing at Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented new and useful Improvements in Speedlndicators, of which the following is a specification.

The object of my invention is to provide an instrument for accurately determining the speed of moving bodies; and the same consists .in the novel features of construction and in the combination and arrangement of parts hereinafter fully described and claimed, and illustrated by the accompanying drawings, in which- Figure l is a vertical sectional view. Fig. 2 is a plan view. Figs. 3, 4, and 5 are detail views of portions of the instrument.

The magnet consists of the upper member A, having the radial arms l, and the lower member B, having radial arms 2, uptu rned at 3 in line with and spaced from arms 2 to form annular space C. The magnet parts are stamped from suitable metal and the lower member B bent to proper form, the alternate arms having opposite polarity. The magnet is secured to the upper end of shaft D, rota table in bushing E, which is vertically adjustable in the lo`wer section F of the case. G is the bushing lockmut, and H the shaft-collar.

Confined between jointed parts F and J of the case are the ring-plates K, carrying the oppositely-extending and inwardly-projecting arms L, which constitute bearings for arbor M, the upper arm carrying adjustable bearing-screw N. Secured to the arbor is arm O, carrying circular armature P, which depends in magnet-space C and is rotatable concentrically therewith.

Q is a pointer or hand carried by the arbor and working over dial R, secured to upper- 'most ring-plate K. The arbor and armature geared to or operatively connected with the u moving part whose speed is to be determined, so as to be rotated thereby at predetermined serai No. 710,022. (No man relative speed. The currents generated by the magnet when thus rotated have an impelling iniiuence on the armature, causing the same to turn with arbor M against the pull of spring S, and the pointer moving therewith over the dial indicates the speed per hour or other unit ofV the moving part. By means of bushing E the vertical relation of the magnet and armature maybe varied as circumstances may require, the greater the dependence of the armature in space C the greater being the impelling force. The instrument-case may be supported and held fixed in any suitable manner. (Not shown.)

By Vmeans of this instrument the speed of moving bodies of many and varied forms may be accurately determined, it being only necessary to so gear shaft D that it will have proper speed relative to the moving body or in lieu thereof to conform the dial to such ,movement Having thus fully described my invention, what I claim, and desire to secure by Letters Patent, is-

1. A speed-indicator comprising a rotary magnet, a vertical arbor having bearings above and concentric with the magnet, an arm projecting laterally from the arbor, a cirL cular armature supported at one side by said arm, a spring for resisting the rotation of the armature in the direction of movement of the magnet, a pointer carried by the arbor, and a scale over which the pointer moves, substantially as shown and described.

2. A speed-indicator comprising a case, a rotatable magnet in the lower part thereof, ring-plates K secured in the case and carrying opposite inwardly projecting bearingarms L, arbor M mounted in the bearings, annular armature P sustainedby the arbor, a spring for resisting rotation of the arbor, a pointer, and a dial, substantially as shown and described.

Aspeed-indicator comprising a shaft; a magnet secured to and rotatable with the shaft, said magnet consisting of the upper member A having radial arms l, and lower member B having radial arms 2, arms 2 having angular extremities 8 alining with but spaced froinfarms l; a circular armature rolIn vtestimony whereof I have hereunto set tatably mounted coneentroally with the said myhand in presence of two subscribing witmagnet and proj eating into the space between' nesses.

arms 1 aild extremities 3 of arms 2; a. spring d JAMES ARMOR. 5 for resisting rotation of the anfnnatuI-e; a Witnesses: pointer rotatable With the armature; and a Y J. M. N ESBIT,

dial; substantially as shown and described. C. C. LEAN. 

